throw by river into
扔进河里
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The amount of garbage can be explained by the fact that residents of the neighbouring villages up the stream may throw it into the river, and here in the reservoir the garbage is piling up.
这么多的垃圾是由于在河流上游附近村庄的居民可能将垃圾扔到了河里，之后垃圾在水库这里堆积起来了。
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